Prüfnäh
Prüfnäh is a term used in textile manufacturing to describe a designated seam used as a reference specimen to evaluate sewing performance and fabric behavior under load. It is not intended as a production seam but as a reproducible sample for testing. The seam is typically produced with production-oriented settings—same stitch type, thread, needle, stitch length, seam allowance, and fabric as the intended product—to ensure relevance of test results. The primary purpose is to measure properties such as seam strength, seam slippage, stitch integrity, puckering, fraying, and overall durability under defined test conditions. The test coupon can be a sewn strip or a panel and is documented with all parameters so tests can be repeated and results compared. Several Prüfnähs may be prepared to compare different needle sizes, thread types, or stitch densities. Testing methods follow standardized procedures, including tensile, peel, or cyclic loading tests, to quantify seam performance. The results inform material selection, thread choice, sewing parameters, and process optimization, and may be used for supplier qualification or quality-control acceptance.
In practice, Prüfnäh serves as a controlled, repeatable reference for evaluating sewing performance in textiles and